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<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>1运算</h1>
${x}+${y}=${x+y}<br/>
${x}-${y}=${x-y}<br/>
${x}*${y}=${x*y}<br/>
${x}/${y}=${x/y}<br/>
${x}%${y}=${x%y}<br/>


<h1>2 关系</h1>
${x}>${y} = ${x>y}

<h1>3. 逻辑</h1>
${a&&b}

<h1>4. 判断空</h1>
${empty a}<br>
${empty name}
</body>
</html>